8491987408 has 60 divisors (see below), whose sum is σ = 17146715040. Its totient is φ = 4073953408.

The previous prime is 8491987331. The next prime is 8491987429. The reversal of 8491987408 is 8047891948.

It is a super-2 number, since 2×8491987408² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2245263 + ... + 2249041.

It is an arithmetic number, because the mean of its divisors is an integer number (285778584).

Almost surely, 2^8491987408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8491987408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8573357520).

8491987408 is an abundant number, since it is smaller than the sum of its proper divisors (8654727632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8491987408 is a wasteful number, since it uses less digits than its factorization.

8491987408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012 (or 3977 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 58.

The square root of 8491987408 is about 92151.9799461737. The cubic root of 8491987408 is about 2040.1860819620.

The spelling of 8491987408 in words is "eight billion, four hundred ninety-one million, nine hundred eighty-seven thousand, four hundred eight".